Comparative structural and fungicidal studies of Mono-methyl phthalate and its Tin(IV) derivatives

The results of an investigation into the fungicidal properties of some organotin(IV) compounds with Mono-methyl phthalate are reported. The compounds were characterized by various spectroscopic techniques including 1H-13C-119Sn-NMR, FT-IR, and 119Sn Mössbauer studies. On the basis of these techniques, all the complexes show penta coordination with a trigonal bipyramidal environment around the tin. The synthesized compounds were tested against a number of plant pathogenic fungi. The fungicidal data reveal that the tri-phenyltin(IV) compound proves to be a powerful fungicide. Comparison between the fungicidal activity of the trialkyltin(IV) compounds shows that the tri-phenyl tin(IV) complex is most active against all plant pathogens; the rest of the complexes also exhibit significant antifungal activity but less than the former one.